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Test NF-5A - Checking Map Sensor Calibration

  1. Turn engine off. Install vacuum "T" in MAP sensor vacuum hose. Connect vacuum gauge to "T". Start engine and let it idle. Using DRB-II, read MAP (vacuum) gauge. If DRB-II vacuum reading is within one in. Hg of teed-in vacuum gauge reading, test is complete.
  2. If DRB-II vacuum reading is not as specified, turn engine off. Disconnect vacuum gauge from MAP sensor. Connect a hand-held vacuum pump to MAP sensor. Apply 5 in. Hg of vacuum to MAP sensor. Using DRB-II, read and record MAP sensor voltage.
  3. Increase vacuum to MAP sensor to 20 in. Hg. Using DRB-II, read and record MAP sensor voltage. Subtract voltage recorded at 20 in. Hg from voltage recorded at 5 in. Hg.
  4. If difference is between 2.3 and 2.9 volts, repair restriction in vacuum hose to MAP sensor. Perform VERIFICATION TEST VER-2  . If voltage difference is not between 2.3 and 2.9 volts, replace MAP sensor. Perform VERIFICATION TEST VER-25  .
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